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112 Commits

Author SHA1 Message Date
Evan Cheng e71fe34d75 Reflects ISD::LOAD / ISD::LOADX / LoadSDNode changes. 
llvm-svn: 30844
 2006-10-09 20:57:25 +00:00
Chris Lattner 398195ebbe completely disable folding of loads into scalar sse instructions and provide 
a framework for doing it right.  This fixes
CodeGen/X86/2006-10-07-ScalarSSEMiscompile.ll.

Once X86DAGToDAGISel::SelectScalarSSELoad is implemented right, this task
will be done.

llvm-svn: 30817
 2006-10-07 21:55:32 +00:00
Evan Cheng 1212b4d249 Not needed. 
llvm-svn: 30674
 2006-09-29 22:05:10 +00:00
Anton Korobeynikov 6f7072c66a Added some eye-candy for Subtarget type checking 
Added X86 StdCall & FastCall calling conventions. Codegen will follow.

llvm-svn: 30446
 2006-09-17 20:25:45 +00:00
Evan Cheng f8464da015 Remove a unnecessary check. 
llvm-svn: 30382
 2006-09-14 23:55:02 +00:00
Chris Lattner 706dd3e0d4 Fix a regression in the 32-bit port from the 64-bit port landing. 
We now compile CodeGen/X86/lea-2.ll into:

_test:
        movl 4(%esp), %eax
        movl 8(%esp), %ecx
        leal -5(%ecx,%eax,4), %eax
        ret

instead of:

_test:
        movl 4(%esp), %eax
        leal (,%eax,4), %eax
        addl 8(%esp), %eax
        addl $4294967291, %eax
        ret

llvm-svn: 30288
 2006-09-13 04:45:25 +00:00
Evan Cheng 9a083a4121 Reflects MachineConstantPoolEntry changes. 
llvm-svn: 30279
 2006-09-12 21:04:05 +00:00
Evan Cheng 11b0a5dbd4 Committing X86-64 support. 
llvm-svn: 30177
 2006-09-08 06:48:29 +00:00
Evan Cheng 2c4e0f120f Oops. Bad typo. Without the check of N1.hasOneUse() bad things can happen. 
Suppose the TokenFactor can reach the Op:

       [Load chain]
           ^
           |
         [Load]
         ^    ^
         |    |
        /      \-
       /         |
      /          [Op]
     /          ^ ^
     |        ..  |
     |       /    |
   [TokenFactor]  |
       ^          |
       |          |
        \        /
         \      /
         [Store]

If we move the Load below the TokenFactor, we would have created a cycle in
the DAG.

llvm-svn: 30040
 2006-09-01 22:52:28 +00:00
Evan Cheng b28800f4d5 Remove dead code. 
llvm-svn: 29962
 2006-08-29 21:42:58 +00:00
Evan Cheng dfb85155dc Don't performance load/op/store transformation if op produces a floating point 
or vector result. X86 does not have load/mod/store variants of those
instructions.

llvm-svn: 29957
 2006-08-29 18:37:37 +00:00
Evan Cheng 358b9ed98a - Enable x86 isel preprocessing by default unless -fast is specified. 
- Also disable isel load folding if -fast.

llvm-svn: 29956
 2006-08-29 18:28:33 +00:00
Evan Cheng c07feb14b0 Avoid making unneeded load/mod/store transformation which can hurt performance. 
llvm-svn: 29952
 2006-08-29 06:44:17 +00:00
Evan Cheng 64a9e28846 Add an optional pass to preprocess the DAG before x86 isel to allow selecting more load/mod/store instructions. 
llvm-svn: 29943
 2006-08-28 20:10:17 +00:00
Chris Lattner 3d27be1333 s|llvm/Support/Visibility.h|llvm/Support/Compiler.h| 
llvm-svn: 29911
 2006-08-27 12:54:02 +00:00
Evan Cheng c3acfc0b10 Do not use getTargetNode() and SelectNodeTo() which takes more than 3 
SDOperand arguments. Use the variants which take an array and number instead.

llvm-svn: 29907
 2006-08-27 08:14:06 +00:00
Evan Cheng 34b70eea5c SelectNodeTo now returns a SDNode*. 
llvm-svn: 29901
 2006-08-26 08:00:10 +00:00
Evan Cheng 61413a3d72 Select() no longer require Result operand by reference. 
llvm-svn: 29898
 2006-08-26 05:34:46 +00:00
Evan Cheng 2d48722e92 Match tblgen changes; clean up. 
llvm-svn: 29894
 2006-08-26 01:05:16 +00:00
Evan Cheng 29ab7c42a8 Doh. Incorrectly inverted condition. Also add a isOnlyUse check to match tablegen. 
llvm-svn: 29741
 2006-08-16 23:59:00 +00:00
Evan Cheng 63d178f473 SelectNodeTo() may return a SDOperand that is different from the input. 
llvm-svn: 29726
 2006-08-16 07:30:09 +00:00
Evan Cheng bd1c5a8fb8 Match tablegen changes. 
llvm-svn: 29604
 2006-08-11 09:08:15 +00:00
Evan Cheng 72bb66a4b8 Eliminate reachability matrix. It has to be calculated before any instruction 
selection is done. That's rather expensive especially in situations where it
isn't really needed.
Move back to a searching the predecessors, but make use of topological order
to trim the search space.

llvm-svn: 29559
 2006-08-08 00:31:00 +00:00
Evan Cheng b9d34bd098 Match tablegen isel changes. 
llvm-svn: 29549
 2006-08-07 22:28:20 +00:00
Evan Cheng 8f585196e1 Reflect change to AssignTopologicalOrder(). 
llvm-svn: 29480
 2006-08-02 22:01:32 +00:00
Evan Cheng 8101dd67d1 Use of vector<bool> causes some horrendous compile time regression (2x)! 
Looks like libstdc++ implementation does not scale very well. Switch back
to using directly managed arrays.

llvm-svn: 29469
 2006-08-02 09:18:33 +00:00
Evan Cheng 45af287957 Factor topological order code to SelectionDAG. Clean up. 
llvm-svn: 29430
 2006-08-01 08:17:22 +00:00
Evan Cheng e8071ecc3b Can't spell. 
llvm-svn: 29383
 2006-07-28 06:33:41 +00:00
Evan Cheng 2e94538b8e Some clean up. 
llvm-svn: 29382
 2006-07-28 06:05:06 +00:00
Evan Cheng e2a3f7014d Rename IsFoldableBy to CanBeFoldedleBy 
llvm-svn: 29376
 2006-07-28 01:03:48 +00:00
Evan Cheng 11a4d8c2f4 Node selected into address mode cannot be folded. 
llvm-svn: 29374
 2006-07-28 00:49:31 +00:00
Evan Cheng 3b5e0cafd1 Another duh. Determine topological order before any target node is added. 
llvm-svn: 29371
 2006-07-28 00:10:59 +00:00
Evan Cheng f38707b8d4 Brain cramp.. 
llvm-svn: 29370
 2006-07-27 23:35:40 +00:00
Evan Cheng 390dd7eb7d Allocating too large an array for ReachibilityMatrix. 
llvm-svn: 29367
 2006-07-27 22:35:40 +00:00
Evan Cheng 87585760ab Calculate the portion of reachbility matrix on demand. 
llvm-svn: 29366
 2006-07-27 22:10:00 +00:00
Evan Cheng d6c0c2dfd9 isNonImmUse is replaced by IsFoldableBy 
llvm-svn: 29365
 2006-07-27 21:19:10 +00:00
Evan Cheng 691a63d564 Use reachbility information to determine whether a node can be folded into another during isel. 
llvm-svn: 29346
 2006-07-27 16:44:36 +00:00
Chris Lattner 0cc5907728 Hide x86 symbols 
llvm-svn: 28976
 2006-06-28 23:27:49 +00:00
Chris Lattner ba1ed585ee Add support for "m" inline asm constraints. 
llvm-svn: 28728
 2006-06-08 18:03:49 +00:00
Evan Cheng e8a42360c5 Cygwin support. Patch by Anton Korobeynikov! 
llvm-svn: 28672
 2006-06-02 22:38:37 +00:00
Evan Cheng a2efb9f3ec Use xor to clear a register. 
llvm-svn: 28667
 2006-06-02 21:20:34 +00:00
Evan Cheng b33e54ead7 Remove bogus comment. 
llvm-svn: 28564
 2006-05-30 20:24:48 +00:00
Evan Cheng 734e1e241b A addressing mode folding enhancement: 
Fold c2 in (x << c1) | c2 where (c2 < c1)
e.g.
int test(int x) {
  return (x << 3) + 7;
}

This can be codegen'd as:
leal 7(,%eax,8), %eax

llvm-svn: 28550
 2006-05-30 06:59:36 +00:00
Evan Cheng 4af59dac0b Assert if InflightSet is not cleared after instruction selecting a BB. 
llvm-svn: 28459
 2006-05-25 00:24:28 +00:00
Evan Cheng 1a8e74d113 Clear HandleMap and ReplaceMap after instruction selection. Or it may cause 
non-deterministic behavior.

llvm-svn: 28454
 2006-05-24 20:46:25 +00:00
Chris Lattner aa2372562e Patches to make the LLVM sources more -pedantic clean. Patch provided 
by Anton Korobeynikov!  This is a step towards closing PR786.

llvm-svn: 28447
 2006-05-24 17:04:05 +00:00
Evan Cheng 85b6232b53 Back out indirect branch load folding hack. It broke some tests. 
llvm-svn: 28425
 2006-05-21 06:28:50 +00:00
Evan Cheng 401049ce33 - Use of load's chain result should be redirected to load's chain operand. 
If it reads the chain result of the call, then the use, callseq_start,
  and call would form a cycle!
- Don't forget handle node replacement!
- There could also be a TokenFactor between the load and the callseq_start.

llvm-svn: 28420
 2006-05-20 09:21:39 +00:00
Evan Cheng a26c451fa2 Missing break statements. 
llvm-svn: 28418
 2006-05-20 07:44:28 +00:00
Evan Cheng b9ac06bb33 Remove unused patterns. 
llvm-svn: 28417
 2006-05-20 01:40:16 +00:00